@INBOOK {OIKEH:2001, title = {Response of N-use efficient and N-inefficient maize and traditional grain sorghum to nitrogen in the northern Guinea savanna of Nigeria}, author = {Oikeh, S. and Carsky, R. and Kling, J. and Chude, V. * and Horst, W. J. }, year = {2001}, type = {Impact, challenges, prospects of maize research and development in West and Central Africa: proceedings of a regional Maize Workshop, 4-7 May, 1999. Cotonou, Benin}, pages = {236--247}, publisher = {WECAMAN; International Institute of Tropical Agriculture (IITA)}, address = {Ibadan, Nigeria}, }